"Your Rikishi copy has the same joint centers as the little girl? I don't know much about rigging so maybe that is my issue but when I tried to morph M3 the clothes just would not fit. I haven't tried in a few years since I never liked his rigging to begin with.

There isn't much that will transfer over morphs for me. Wardrobe Wizard helps but it isn't workable in a lot of instances. It also takes a while."

 

No, joint centers are of course completely different, even tough with the new functional scaling a lot is possible.

Well, the "easiest" solution for what you want is Genesis in Studio, where the joint centers are directly linked to a bodymorph and clothes can get auto-converted.

You can have some of that Genesis functionality in Poser, but this goes far beyond "simple" weightmapping:

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2842891

Weightmapping by itself just improves bending.

To have convenient "one size fits all" technology you need to use the animateable joint centers and all clothes need to be prepared for this, too.

Above picture shows my weightmapped David 3 using Stephanie 3 as a fullbody morph. The joints are almost identical except for the buttock/thigh centers, so I simply moved those around using the appropiate dials instead of re-rigging David to match Stephanie's joints.

Extreme custom morphs like my Rikishi clone that aren't just "dial spun" combos of existing morphs always need an extra layer of work. Either an automated conversion like WardrobeWizzard or you manually convert the clothes in a modeller.